438 



BOARD OF AGRICULTURE. 



Fig. it. 

 Eggs of CEcanthiis. 

 (I. Irregular row of i)unc- 

 tures. 



b. The same laid open. 



c. An egg enlarged. 



d. The end of the same. 



Family LOCUSTIDiE. 



Katydids. 



Head placed perpendicularly ; antennae 

 longer tban the body, slim, tapering and 

 many jointed. Eyes hemispherical, ellipti- 

 cal or ovoid ; ocelli nearly always wanting ; 

 labrum circular. 



Wings and wing covers generally well 

 developed, though sometimes shortened or 

 wholly wanting. The chirping or stridula- 

 ting organs consist of a transparent mem- 

 brane, in a more or less rounded, thick ring, 

 situated in the anal field of the wing covers 

 of the male. The stridulation is made by 

 rubbing the bases of the wing covers to- 

 gether. Near the upper end of the fore 

 tibijE there is an oval cavity covered with 

 a membrane (auditory sac). Tarsi four- 

 jointed, without pulvilli or pads between the 

 claws. 



The New England Genera may be sepa- 

 rated by means of the following table : — 



'•{ 



the whole top of the thorax 

 Willi? covers expanded in the middle . 

 Winji covers not expanded in the middle 



f Wingless, or with rudimentary wings and wing covers . . 2. 

 ^ Winged 3. 



Wingless ; pronotum not covering the whole top of the 

 thorax Ceuthophilus. 



Pronotum covering the whole top of the thorax . . Thyreonotus. 



4. 

 6. 



Wing covers much broader in the middle, concave . Cyrtophyllus. 



Wing covers somewhat broadened in the middle, not concave . 5. 



/ Ovipositor very small Microcentmm. 



I Ovipositor of medium size Amblycorypha. 



j Vertex of the head with a conical projection forward . Conocephalus. 

 \ Vertex of the head without a conical projection .... 7. 

 r Ovipositor straight, or nearly so ; insect small . . Xiphidium. 

 \ Ovipositor curved ; insect large Scudderia. 



Genus Ceuthophilus. Scudder (1862). 



"Head rather large, oval; antennae loug, slender, cylindrical; 

 first joint as broad as long, larger and stouter than the rest, which 

 are about equal in thickness, gradually tapering to the extremity ; 

 second, quite short; third, longest; the remainder unequal. Eyes 

 sub-pyriform, sub-globose, crowded against the first swollen joint 



